The act specified that all Commonwealth citizens, including
citizens of the UK and Colonies (CUKCs), without a relevant connection to the UK were subject to immigration control. A person was exempt from immigration control if the person was a Commonwealth citizen born in the UK; a Commonwealth citizen holding a passport issued by the UK government in either the UK or Republic of Ireland; a CUKC holding a passport issued by the UK government (not including colonial governments) anywhere; and their family members. Exemptions also applied to Commonwealth citizens who were ordinarily resident in the UK at any point from 1960 to 1962, as well as wives and children under 16 accompanying a family member resident in the UK. The act went into effect on 1 July 1962.
Claudia Jones, a Trinidad-born Communist activist, asserted in 1962 that the act "established a second class citizenship status for West Indians and other Afro-Asian peoples in Britain."
Ambalavaner Sivanandan, an anti-racist activist, argued that the Act served to 'enshrine state racism in law', while Labour politician
Barbara Castle labelled it 'a violation of the very idea of the Commonwealth.' ==Aftermath==